Happened to me with my second too.
so not anything to necessarily be concerned about regarding the baby?
It has to do with your pelvic floor. It is common but not normal. There are a ton on Instagram that share exercise but you can ask you OB about a pelvic floor physical therapist Also may be more related to your previous pregnancy than your current one but exacerbated by your growing uterus
Years ago when I was not pregnant I had a extremely bad cough and same thing happened to me its a muscle control thing when coughing